Singapore - Singapore's founding father Lee Kuan Yew was discharged from a hospital after treatment for an abnormal heart rhythm, his office said Monday.

Lee, who turns 85 on Tuesday, was treated Saturday at Singapore General Hospital for atrial flutter and released Sunday.

Doctors pronounced the minister mentor's condition as stable, his office said. He was advised to resume his official schedule gradually.

From his hospital room, Lee delivered a speech Saturday night via video link to the Global UBS Philanthropy Forum.

Lee, Singapore's prime minister for 31 years from the founding of the city-state, currently serves in an advisory capacity in the cabinet of Prime Minister Lee Hsien Loong, his 56-year-old son.

The elder Lee had two operations in 1996 to clear a blocked artery. He is known to exercise regularly. (dpa)